From: Cristian Mitu <[email protected]> Reply-To: "[email protected]" <[email protected]> Date: Sunday, July 6, 2014 at 9:06 AM To: "[email protected]" <[email protected]> Subject: Re: [beagleboard] BeagleBone Black Current Consumption
> Hello John, > > I have looked at the link you have sent and it is a good idea but i can just > hook up a multimeter and see the current consumption that way since i don't > have time to wait for the device to come. You were asking questions about current consumption so I assumed you didn¹t have any way to measure the BBB current requirements. Also see BBB SRM Section 6.1.7. > > > Anyway as a slightly different question: I have been looking into the > datasheet of the BBB and it says i can power the board thorugh the expansion > header but doesn't specify much else about that and the internet isn't too > clear on some details. So what i want to know is the following: > > - Are the pins i am supposed to power the beaglebone through pin 5 and 6 on > P9? ( i am asking this beacuse when i powered the board through the barrel > connector those pins outputted 5V ). This is the purpose of these pins. These pins are directly connected to the barrel connector. > > > - Is there a limit to how much power can be drawn through those pins, or does > it draw however much the BBB needs ( i am estimating that with wifi and > everything else it can get up to 600-700mA). The reference manual states that > those pins can dish out 1A for supplying any add-ons, is it the same for when > you supply power to them. On the board i am making the 5V voltage regulator > that supplies the BBB can handle 2A so i am covered on that end. Going back to BBB SRM Section 6.1.7, the BBB these are the typical current requirements for the board. However, if you add capes, this current will increase, but is limited by the settings in the TPS65217C PMIC (see datasheet page 9 and page 43). Currently, the BBB current limit is set at 1,300mA which is set in the u-boot environment or uEnt.txt file. If you use a regulator on your board to power the BBB, that is fine; however, if you use a regulator on your board to power your circuitry, make sure you only enable that regulator with the 3V3B voltage rail. Pay attention to the BBB SRM Section 7.1.2 (red warning). Also see BBB SRM Section 8.6.1. Regards, John > > > > 2014-07-05 21:49 GMT+02:00 John Syn <[email protected]>: >> >> From: Cristian Mitu <[email protected]> >> Reply-To: "[email protected]" <[email protected]> >> Date: Saturday, July 5, 2014 at 12:37 PM >> To: "[email protected]" <[email protected]> >> Subject: Re: [beagleboard] BeagleBone Black Current Consumption >> >>> Ok now i see it specifies above the cnditions in which the test was done >>> with practically everything connected. The only thing i need to know now is >>> by how much the currentconcumtion rises while using wifi. Probably a litle >>> bit over 500mA. >> http://www.hardkernel.com/main/products/prdt_info.php?g_code=G137361754360 >> >> If you don¹t have a way to measure the current consumption, this device might >> be handy. >>> >>> >>> >>> 2014-07-05 20:29 GMT+02:00 Cristian Mitu <[email protected]>: >>>> Oh yes i have seen that part, i wasn't sure beacuse it said TBD in the >>>> table but now i see that that is only for the reset state only. And from >>>> what i understand the USB's are limited to 500mA, and the kernel booting >>>> peak is 460mA. But it doesn't specify for the other devices. >>>> >>>> >>>> 2014-07-05 20:11 GMT+02:00 William Hermans <[email protected]>: >>>> >>>>> Cristian, >>>>> >>>>> There is a table of power consumption conditions in the TRM for the >>>>> Beaglebone black. 460 ish mA when everything like USB / ethernet / hdmi >>>>> etc is used( if memory serves ) But do double check, as my memory for such >>>>> things isnt always perfect. >>>>> >>>>> >>>>> On Sat, Jul 5, 2014 at 10:42 AM, Cristian Mitu <[email protected]> >>>>> wrote: >>>>>> Hello, >>>>>> >>>>>> I need to know how much current does the beaglebone black need in two >>>>>> situations: >>>>>> >>>>>> - worst case scenario - where everything is used (except extension >>>>>> headers) >>>>>> - specific setup - where i use the usb for wifi , data cable plugged in >>>>>> and debuger at once. >>>>>> >>>>>> The data sheet says 1A is sufficient for powering the board but if i have >>>>>> power hungry devices like the wifi more may be needed. >>>>>> >>>>>> Regards, >>>>>> Cristian >>>>>> -- >>>>>> For more options, visit http://beagleboard.org/discuss >>>>>> --- >>>>>> You received this message because you are subscribed to the Google Groups >>>>>> "BeagleBoard" group. >>>>>> To unsubscribe from this group and stop receiving emails from it, send an >>>>>> email to [email protected]. >>>>>> >>>>>> For more options, visit https://groups.google.com/d/optout. >>>>> >>>>> -- >>>>> For more options, visit http://beagleboard.org/discuss >>>>> --- >>>>> You received this message because you are subscribed to a topic in the >>>>> Google Groups "BeagleBoard" group. >>>>> To unsubscribe from this topic, visit >>>>> https://groups.google.com/d/topic/beagleboard/A9I79N2WyqM/unsubscribe. >>>>> To unsubscribe from this group and all its topics, send an email to >>>>> [email protected]. >>>>> For more options, visit https://groups.google.com/d/optout. >>>> >>> >>> >>> -- >>> For more options, visit http://beagleboard.org/discuss >>> --- >>> You received this message because you are subscribed to the Google Groups >>> "BeagleBoard" group. >>> To unsubscribe from this group and stop receiving emails from it, send an >>> email to [email protected]. >>> For more options, visit https://groups.google.com/d/optout. >> -- >> For more options, visit http://beagleboard.org/discuss >> --- >> You received this message because you are subscribed to a topic in the Google >> Groups "BeagleBoard" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/beagleboard/A9I79N2WyqM/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> For more options, visit https://groups.google.com/d/optout. > > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
